For some specialty application I can see the usefulness of digitizer pen input like some Thinkpad X series models (e.g. X220T). But fat-finger touch? What for?
I can see a giant tablet with a desktop stand and keyboard becoming the new PC as a more plausible scenario than the iMac/OS X getting a touch UI.
Apple said the touchbar is their first foray into a new system of inputs, perhaps a larger touchbar and some sort of haptic feedback is a new interface their going down, I think that could actually be pretty cool and innovative.
As for putting a touch screen on everything and desktops, eh... I mean, that Surface Studio looks amazing and likely appeals to creative professionals, but probably doesn't effect many people besides that. Kudos to them for the innovation, but I don't think it represents a better ecosystem.
I hope they don't come up with any other funny ideas.